By Steven Voser Reviewed by: Gloria Payá

Worm castings are a powerful organic fertiliser rich in nitrogen and many other nutrients. Commonly used by all manner of gardeners and farmers, learn more about the benefits of worm castings for cannabis plants below, and how to apply them in multiple ways in your grow-op.


What Are Worm Castings?

Worm castings, also known as vermicast, are essentially the waste produced by red Californian worms (Eisenia fetida). Worms feed off of and decompose pretty much all organic matter, meaning that anything that once lived eventually becomes worm food—from fruits and vegetables to humans. As they feed, worms produce manure (i.e. worm castings), which, thanks to their unique digestive systems, are rich in nutrients and beneficial microbes that benefit the growth of plants and help to establish a healthy soil ecosystem.

What Is Vermiculture and Vermicompost?

The term "vermiculture" refers to the process of breeding and producing worms to decompose waste. If you've got a worm bin at home, you're actively practising vermiculture already. If you don't, getting started is as simple as getting your hands on some Californian red worms, giving them a home in a bin or similar structure and feeding them (which is as simple as reserving the scraps from your kitchen every time you cook).

The term vermicompost, on the other hand, refers to the final product produced by composting worms (i.e. worm castings). Worm castings are dark brown or black in colour and have a texture similar to coffee grounds. They smell like fresh, fertile earth and can be used to top-dress potted plants or mixed directly into your soil/potting mix before planting.

Worm Castings

Why Are Worm Castings Good for Cannabis Plants?

Farmers and gardeners have long been using worm castings to fuel the growth of their plants. And cannabis growers can do the same. Worm castings are a great fertiliser with many benefits for cannabis plants, including the following.

1. Worm Castings Are Rich in Nutrients

Worm castings, like other forms of manure, are naturally rich in nutrients and organic matter that your weed plants can absorb to fuel their growth. The most prominent nutrient is nitrogen (in the form of highly concentrated nitrates), but worm castings also contain a rich array of other nutrients, including:

  • Phosphorus

  • Magnesium
  • Calcium
  • Manganese
  • Iron

  • Carbon
  • Zinc
  • Copper

Unlike regular chemical fertilisers, however, the nutrients in worm castings aren't readily available to plants, which greatly minimises the risk of overfeeding. The nutrients in worm castings first need to be broken down by soil organisms, and thereby offer a much slower release of nutrients to your plants, allowing for gradual, more controlled feeding.

2. Worm Castings Help to Improve Soil Quality/Health

Besides providing a variety of nutrients for your cannabis plants, worm castings also improve the quality of your soil considerably. And as we've said in many of our other articles on cannabis growing, healthy soil is the key to healthy marijuana plants. Some of the ways worm castings improve soil include:

  • Improving soil aeration: Well-aerated soils make it easy for roots to respire and grow, helping cannabis plants produce large, strong root systems.
  • Increasing water retention: Soils with higher moisture retention need to be watered less frequently and help to anchor nutrients that would otherwise leech out of the soil during watering.
  • Boosting microbial soil life: Worm castings contain nutrients that feed beneficial bacteria, fungi, and other microorganisms that produce and store plant nutrients as well as minimise pests/pathogens (see below).

3. Worm Castings Improve Plant Health

Through their rich concentration of nutrients, worm castings directly stimulate both the vegetative growth of cannabis plants and their ability to produce healthy, resinous flowers. However, studies show that worm castings also benefit plants by:

  • Improving seed germination rates[1].
  • Curbing pathogens[2], particularly those that cause root diseases such as root rot and damping off.
  • Repelling pests such as mites, aphids, and mealy bugs—partially because worm castings naturally weaken the protective shells of some of these insects.

Cannabis Plants

Will Worm Castings Burn Cannabis Plants?

As mentioned earlier, the nutrients in worm castings aren't readily available to your plants like those found in liquid chemical fertilisers. Instead, they are released into the soil gradually and in a controlled manner. Plus, many of the organisms present in your soil ecosystem will also feed off the nutrients in worm castings. Therefore, worm castings are very unlikely to cause nutrient burn in cannabis plants.

How to Make Worm Castings for Cannabis

Making worm castings is a pretty straightforward process and only requires three ingredients:

🗑️ A vermicompost/compost bin

🐛 Red Californian earthworms

🍐 Organic matter to feed the worms

Buying/Making a Vermicompost Bin

Vermicomposting has gained a lot of attention lately, meaning vermiculture products such as worm farms are becoming ever more accessible. Even in large cities, growers have, in some way or another, incorporated vermicomposting into their lifestyle.

If you want to start making your own vermicompost for your cannabis garden, either shop for a worm bin to suit your needs or consider building one.

Compost House

Sourcing Californian Compost Worms

Not all worms are equally effective for composting. By far the most commonly used worms for vermiculture are Eisenia fetida, which you can buy from garden centres or grow shops. A single node/pack of worms is usually all you'll need to get your vermicompost started. In spring and summer, the worms will reproduce very actively and, as long as you keep an eye on the mix of ingredients you're putting in your bin, you'll soon have more worms than you'll likely need.

Feeding Your Worms and Keeping a Healthy Compost Heap/Bin

Arguably the biggest challenge of making your own worm castings is maintaining a healthy compost bin. Essentially, this involves putting the right amount of the right ingredients into your compost. Without getting too detailed, this basically boils down to striking the right balance between:

  • Green ingredients: Such as fruit/vegetable scraps, plant/grass cuttings, used tea leaves and coffee grounds, and egg shells.
  • Brown ingredients: Scrunched-up pieces of paper and cardboard, egg cartons, and dried leaves/dead plant matter.

Compost

Which Worm Castings Are the Best for Cannabis?

Some of the main concerns about the quality of worm castings are:

  • The ingredients that the worms were fed: Putting diseased plant matter into your compost bin, for example, may result in pathogens living in your worm bin and possibly affecting any plants that you later fertilise with the finished worm castings.
  • The age of your worm castings: Worms take roughly 2–3 months to decompose organic matter and produce castings. Using worm castings that haven't been completely decomposed may also introduce decomposing scraps into your garden and attract pests/pathogens.
  • Storage: Many gardeners like to mature their worm castings for 6 months or longer, claiming that castings get better with time. When storing worm castings, it's important that they do not dry out, become overly humid, or exposed to direct sunlight. All of these factors can kill some of the living organisms in the castings.

Ideally, the best worm castings for weed are those that you make yourself using a compost bin or heap. However, not every cannabis grower has the time or space to dedicate to composting (which is understandable). In that case, we recommend buying high-quality worm castings from a garden shop/centre. Where possible, be sure that the worm castings are relatively fresh or have been stored appropriately.

Vermiculture

How to Use Worm Castings in Your Cannabis Grow

Using worm castings in your cannabis garden is a simple way to fertilise your plants, promote soil health, and strengthen the root zone. In what follows, we’ll teach you how to use worm castings to support the health and growth of your cannabis garden.

Using Worm Castings in Soil

One of the best ways to use worm castings in your cannabis grow is as a soil amendment:

  1. Prepare a large, clean tub, wheelbarrow, or other container to mix your soil.
  2. If you're not using any other natural fertilisers as a soil amendment, you can use up to 1 litre of worm castings for every 2 litres of soil.
  3. If you're using other natural fertilisers to amend your soil, use 0.5 litres of worm castings for every 2 litres of soil to avoid ending up with a soil that's too nutrient dense (or "hot").

Worm Castings in Soil

Using Worm Castings to Top-Dress Soil

Another great way to use worm castings in your cannabis grow is to apply it directly to the topsoil. Apply roughly 0.5–1 cup (8–16 tablespoons) of worm castings in a circle around the base of your weed plants.

Worm Castings Compost Tea

Last but not least, you can also fertilise your cannabis plants by using worm castings to make a nutrient-rich "tea."

  1. Add your worm castings into a porous bag and close.
  2. Fill a 20l bucket with unchlorinated water.
  3. Place the porous bag of worm castings into the bucket of water and soak overnight.
  4. Remove the bag of worm castings. Your worm casting tea is now ready, and can be used as a foliar spray or a liquid fertiliser.
Compost Tea

Worm Castings: A Versatile, Natural Cannabis Fertiliser

Worm castings have long been a favourite among gardeners and farmers. To cannabis growers, they offer all the same benefits and make for a natural, versatile fertiliser that not only feeds your plants, but also improves soil health and structure.

Disclaimer:
This content is for educational purposes only. The information provided is derived from research gathered from external sources.

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Privacy Policy - Royal Queen Seeds

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COMPANY NAME: SNORKEL SPAIN, SL (hereinafter ROYAL QUEEN SEEDS)

C/ Vilar d'Abdelà, 5 (nave 1) CP: 08170 de Montornès del Vallès

+34 937 379 846

support@royalqueenseeds.com


The present Privacy Policy sets out the terms on which we will treat personal data at ROYAL QUEEN SEEDS; this includes any personal data collected through our website https://www.royalqueenseeds.com/ as well as any other data we process in the course of our business activities.

ROYAL QUEEN SEEDS collects the following personal data for the purposes listed below:

SECTION 1 – PERSONAL INFORMATION WE COLLECT

1.1 Account purchases

Account purchases can only be made if you are in possession of a personal account. When you create an account or purchase something from our shop, as part of the buying and selling process we collect the following personal information that you provide to us:

This information is required for delivery. In addition, when you browse our shop, we automatically receive the Internet Protocol (IP) address of your computer. Based on this information, we can optimise your online experience and at the same time protect our online environment.

Purpose of data collection

We collect and store account-related data for the following purposes:

(a) to carry out obligations arising from any contracts between you and us, and to provide you with information, products and services that you may request from us;

(b) to set up, manage and communicate with you about your account and your orders;

(c) to conduct market research and analysis;

(d) to confirm your age and identity, and to detect and prevent fraud.

1.2 Newsletters

With your explicit permission, we may send you newsletters about our shop, new products and other updates. We send newsletters based on your explicit consent. In the event that you purchase a product, and in accordance with current regulations, we may send you commercial communications in accordance with the legitimate interest of our company, always about products or services similar to those you have purchased or contracted. In any case, you may exercise your right of opposition through the channels announced in this Privacy Policy. The following information is collected in relation to the newsletter:

We do not need to know the sex of the person in order to send the newsletter (data minimisation: by law we must ask for data that is strictly necessary to provide the service, and in this case knowing the sex is not necessary to send the newsletter).

Purpose of data collection

The data collected is used to:

(a) personalise our emails, including your name and gender;

(b) provide gender-specific content.

You can withdraw your consent at any time by using the link provided in the newsletter or the contact information provided in section 2.

1.3 Customer service and contact form

In order to provide appropriate support, our customer service employees have access to information related to the account. Consequently, their support will be highly effective and friendly. The data provided in our contact form is used by our CRM provider, SuperOffice. We will only use your details to respond to your message.

SECTION 2 – LEGITIMATE INTEREST

If you have purchased any of our products, please note that we may process your personal data for promotional purposes, based on Royal Queen Seeds' legitimate interest only to offer you products or services from our company and about products or services similar to those you have purchased. You may exercise your right to opt out of future messages by the means set out in this Privacy Policy or through any notification you receive.

2.1 How do you withdraw consent?

If you change your mind, you can withdraw your consent for us to contact you for the purpose of collecting, using, or disclosing your data at any time by reaching out to us at: support@royalqueenseeds.com.

SECTION 3 – DISCLOSURE

We may disclose your personal information if we are required to do so by law or if you breach our Terms of Service.

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At Royal Queen Seeds, we will not retain your data for longer than is necessary for the purposes described in this Policy. Different retention periods apply for different types of data; however, the longest period we will normally hold any personal data is 10 years.

4.1 Account information

Data relating to the account remains relevant for as long as the consumer is in possession of an account. Therefore, the data remains documented for as long as the account exists. When our customers delete an account, the associated data will be deleted within a reasonable period of time. Requests regarding the inspection or correction of stored personal data or the deletion of an account can be sent to support@royalqueenseeds.com.

4.2 Newsletters

In the event that you give us your consent to inform you about our products or services, we will keep your data until you express your wish not to receive any further communications from us. However, we regularly (every month) carry out a relevance check. Registered customers (and their personal information) will be deleted whenever customers do not reply to our request. In addition, our newsletter mailing has an opt-out feature. Consumers can withdraw their consent by using this opt-out feature.

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Third-party services are required to conduct transactions and provide our services. In general, the third-party providers we use will only collect, use and disclose your information to the extent necessary to enable them to perform the services they provide to us.

However, certain third-party service providers, such as payment gateways and other payment transaction processors, have their own privacy policies regarding the information we must provide to them for your transactions.

We encourage you to read the privacy policies of these providers so that you can understand how these providers will handle your personal information.

In particular, certain suppliers may be located or have facilities located in a different jurisdiction than yours or ours. Therefore, if you choose to proceed with a transaction involving the services of a third party, your information may be subject to the laws of the jurisdiction in which that service provider or its facilities are located.

Once you leave our website or are redirected to a third-party website or application, you are no longer governed by this Privacy Policy or the Terms of Service of our website.

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On this website we have integrated an element of a web analytics service (with anonymisation functionality). Web analytics can be defined as the gathering, processing and analysis of data about the behaviour of visitors to websites. An analytics service collects, among other things, data about which website a person came from (the so-called referrer), which sub-pages they visited or how often and for how long they visited a sub-page. Web analytics is mainly used for website optimisation and for a cost–benefit analysis of internet advertising.

Courier service

To complete deliveries we use a courier service. This courier service carries out the delivery between our company and the consumer's home. To complete these logistics, the company requires access to the consumer's name and address information.

Mailing service

Royal Queen Seeds uses a third-party mail service provider to send its newsletter. This provider has access to limited account information related to opt-in consent (e.g. email address).

Marketing services

Royal Queen Seeds has the support of a company that specialises in marketing and communication activities. Their access to personal information is very limited and mostly anonymous.

Payment services

At Royal Queen Seeds we use external payment services to handle our transactions (e.g. credit card payments).

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To protect your personal information, we take reasonable precautions and follow industry standard best practices to ensure that it is not inappropriately lost, misused, accessed, disclosed, altered or destroyed.

If you provide us with your credit card information, the information is encrypted using secure socket layer technology (SSL) and stored using AES-256 encryption. Although no method of transmission over the internet or electronic storage is 100% secure, we follow all PCI-DSS requirements and implement additional industry standards that are commonly accepted. Information related to the account is protected with a hashing method. This method transforms the information into a generated hash. As a result, confidential information is protected and invisible, even to us. In addition, our databases are exceptionally protected against unauthorised access. For example, access to the database is only possible and permitted via approved IP addresses (e.g. from Royal Queen Seeds headquarters). Other attempts and addresses are rejected at all times.

Furthermore, data is anonymised as much as possible, so it cannot be directly linked to a specific consumer. With this data, however, we may be able to carry out market research and analysis. In addition, the third parties concerned (e.g. mailing service) are examined prior to our collaboration, comply with the GDPR from the EU and receive a processing agreement. Within Royal Queen Seeds, employees are assigned different access permissions. Specific permission provides access only to information that is strictly required to perform a task. Digital security measures are subject to change and must meet high requirements to ensure the safety of online customers. That is why, at Royal Queen Seeds, we appoint a security officer. Regular verification and improvement of security measures (where necessary) are part of the role.

SECTION 7 – CHANGES TO THIS PRIVACY POLICY

We reserve the right to modify this Privacy Policy at any time, so please check back regularly. Changes and clarifications will be effective immediately upon being published on the Website. If we make substantial changes to this policy, we will notify you here that it has been updated so you will know what information we collect, how we use it and under what circumstances, if any, we use and/or disclose it.

SECTION 8 – YOU HAVE THE RIGHT TO: